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Template class error

 
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ashmon



Joined: 06 Oct 2007
Posts: 1

PostPosted: Sat Oct 06, 2007 7:28 pm    Post subject: Template class error Reply with quote

Hi all,

I am trying to implement a linked list in D and here is the code:

In LinkNode.d:

module LinkNode;

public class Link(T)
{
private:
T data;
Link next;

public:

this()
{
}

this(Link nextNode)
{
next = nextNode;
}

this(T item, Link nextNode)
{
data = item;
next = nextNode;
}

T getElement()
{
return data;
}

Link getNext()
{
return next;
}

void setElement(T nodeItem)
{
data = nodeItem;
}

void setNext(Link nextNode)
{
next = nextNode;
}

}

In LList.d:

module LList;

import LinkNode;

public class LList(T)
{
private:
Link!(T) head;
Link!(T) tail;
Link!(T) curr;
public:

this()
{
}

}

In Driver.d:

import std.stdio;
import std.string;
import LList;

int main()
{


LList!(int) var3 = new LList!(int)();

var3.insert(3);
var3.nextNode();

writefln("%d",var3.currentValue());

return 1;

}

When I compile, I get the following erros:

C:\LinkedList\Driver.d(8Cool: template instance LList is not a template declaration, it is a import
C:\LinkedList\Driver.d(8Cool: Error: LList!(int) is used as a type
C:\LinkedList\Driver.d(8Cool: variable Driver.main.var3 voids have no value

I have been working on this forever and can't find a solution. Any help would be appreciated.

Thanks,

Ashmon
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pqnelson



Joined: 03 Jun 2007
Posts: 13
Location: Davis

PostPosted: Wed Oct 31, 2007 5:56 pm    Post subject: Reply with quote

Disclaimer: when I compiled this, the GNU D Compiler gave me a number of bugs due to the template usuage, use of an "N" flag, etc. Oddly enough, your bugs went away, so I think it should compile on windoze (which I suspect you are using).

Anyways, here is the modifications I did to your code:

Code:
import std.stdio;
import std.string;
import LList;

int main(char[][] args)
{
/* because you named the module the same thing as the class, you need
 * to make certain that you write LList.LList so the compiler doesn't
 * bork up!
 */
   LList.LList!(int) var3 = new LList.LList!(int)();

   var3.insert(3);

   writefln("%d",var3.currentValue());

   return 1;

}


Since the code snippet you gave me didn't exactly work, I also had to modify the LList.d file:

Code:
module LList;

import LinkNode;

public class LList(T)
{
   private:
      Link!(T) head;
      Link!(T) tail;
      Link!(T) curr;
   public:
      this()
      {
      }
      // these I added because they were not defined
      void insert(T t)
      {
         Link!(T) tmp = new Link!(T)(t, curr);
         curr = tmp;
      }
      T currentValue()
      {
         return curr.getElement();
      }
}
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